Feed device for portable tools



Oct. 13, 1942. H. MILBERG 4 FEED DEVICEFOR PORTABLE TOOLS 2 sheds-sheet v1 Filed June lO, 1940 Ht-man Mlf'baer @2M MM lOct. l3, 1942. H. MILBERG FEED DEVICE FOR PORTABLE TOOLS Filed June 1o, 1940 '2 sheets-sheet 2 Herman' 'Milber the levers.

' 'e fnermanimberslfllnionlm -4 Application Jnne'lii;

` My invention -relatesvto feed devices for"po rt' able tools andhasfortanvobject toprovide a feed device having anf actuator movable inl a` directiontoward the' work tojprocure relative I movement of vthe V.worlrand the tooltoward each An object of the-invention resides in providing a feed device which may be attached to a portable drill and whenpositioneddoes not project e suiciently'outwardlybeyond the drill to incon-r` venience the operator in use of the drill.

Another object lof theinvention resides inpro- ,g viding a feed device utilizing two connectors and employing equalizing means for uniformly v`tensioning both connectors.

ing a feed device adapted to. beeasily and quicklyattached to portable tools such as electric drillsand the like. l' y Y Another object ofthe invention resides in pro-` in a direction to tension the connector or connectors. v

A still further object of the invention resides diate their ends to the support and in securingl the connectors to the ends of the levers nearest the work.

An object of the invention resides in connect--v ing to the other ends of the levers an actuator for moving the levers in a manner to tension the connectors.

A feature of the invention resides in pivoting'A said levers to said support at such localities as arms of the levers. e v Anotherv feature-of the invention resides in providing resilient means acting between the le# 1940', sessi No. 339,734.

(01. Jr-'.33 f Y l isa side elevationalv view of an electric drill illustrating an embodiment of my invention `applie'dthereto. A e y v Fig. -2 is a plan view of. the feed device removed from the'drm. f

Fig. 3 is a view similar to Fig. 2 showing the parts in altered position. y

' is an end view of the structure shown.

on line 5-5 of Fig. 2.

` In theuse of electric/drills, particularly for heavy work, it Ybecomes exceedingly difficult to lli exert suilicient pressure on the breastplate of An object of the invention resides `in providl the drill to procure successful operation of the drill. 'Feed deviceshave heretofore been employed utilizing screws and similar expedients. Buch feed devices are highly unsuitable and zovundesirable due to the fact that movement Vof viding a support carried by the `tool and having pivoted thereto one V'or more levers movable the actuator is in a lateral direction with respect to the axis of the drill which would tend to throw the drill out of alignment. In addition such devices are extremely slow and clumsy to operate.

25 The present invention,overcomes 'these disad` in utilizing two crossed levers pivoted interme- 3l! drill.

For the purpose of illustrating my `invention I have shown in Fig. l an electric drill indicated in itsentirety by the reference numeral I0.. This drill comprises an electric motor Il having end 35 bells l2 and Il, and a-body portion I4 disposed to form shortarms andlong armsin the lever... and in connecting the connectors to 'the short therebetweenr 'I'he body i4 has issuing from the lowermost portion thereof a pistol grip handle Il provided with atrigger I8 for operating the switch for the motor. This body portion also ,40 basa steadying handie'il extending in the opversand serving to move'the same in a directionvvopposite to that caused by the-actuator.

.e An object of the vinvention residesin ing hand grip Il which is enlarged at the outer-- structing the actuator in the form of la breastmoet portion thereof toiorm a breastplate Il.-

plate and in Lv connecting one or both ends oi the bre `A still further obiectoffthe invention resides informing the Abreas'tplate at ,one lend thereof ,withV a slct, y and iti-providing the' lever with a member slidable along said slot. v i

Other objects of the invention reside inthe novel combination and arrangement of parte and in the details Voi construction hereinafter illust trated Sind/0l' delllbed', l

ate, tothe outermost endsoi.Lv

4s ,This breastpia is renuvevxy narrow 4ma n i i elongated in form, being provided with extensions 2i which project outwardly` beyond the handgrip I1.` The end bell-.II forms a gear housing Adrilii's illustrated as'cnsaslns the work 2 5 to u. -Theinvention properA 2lv an elevational sectional view takeny of the angle member 21.

which consistseof two angle members 21 and 28 which are situated side by side and which have flanges 29 lying in a common plane, and iianges 3| projecting outwardly therefrom. By means of this construction the support becomes channelshaped in cross section. The angle member 28 has welded to it two angle-shaped brackets 32 and 33 which have flanges 34 resting upon the ange 29 of saidangle member and which haveanges 35 projecting outwardly therefrom. The anges 34 of both of these brackets are welded to the flange 29 of the angle member 28. The two flanges 34 of the brackets 32 and 33 are constructed with transverse slots 36, best shown in Fig. 4, which slots extend across the flange 29 This flange has welded to it two studs 31 which project through the slots 36. By means of these studs and slots the angle member 21 is guided for movement toward and from the angle member 28. Nuts 38, screwed upon the studs 31, hold the angle member 21 in adjusted position relative to the angle member 28. As will be seen in Fig. 4 the two fianges 29 of the angle members 21 and 28 are spaced from one another to form a slot 39 therebetween. The

flange 29 of the angle member 28 has secured to the ends thereof two fingers 4| which are welded thereto and which overlie the flange 29 of the angle member 21. These fingers close the ends of the slot 39.

The support 26 is attached to the breastplate |9 of the drill I0 by means of two metal clips 42 and 43 which engage the extensions 2| of said I`breastplate and clamp the same against the flanges 29 of the angle members 21 and 28. Inasmuch as both of these clips andthe structure for attaching the same to the support 26 are identical, only the clip 42 and its associated structure will -be described in detail.

The clip 42 is constructed from a sheet of metal which is bent to provide an overlying platelike portion 44 adapted to extend across and rest upon the anges 29 of the angle members 21 and 28. Said clip is further formed with a projecting portion 45 which extends angularly from the portion 44 and which is adapted to overlie the extension 2| of the breastplate I9. The portion 44 has issuing from it a stud 46 which is welded thereto. 'I'his stud extends through the slot 39 and through a large washer 41 disposed upon the opposite sides of the flanges 29. A nut 48, preferably a wing nut, is screwed upon the end of the stud 46 and clamps the clip in position with reference to the support 26. It will be noted that the clip 42 is disposed between the flanges 3| of the angle members 21 and 28. By means of the construction described the clip 42 may be adjusted longitudinally of the support 26 from a position adjacent the flnger 4| to a position adiacent the bracket 32.

The invention includes two crossed levers and 52 which are disposed between the two flanges 35 of the two brackets 32 and 33. These two levers are constructed of bar material and are pivoted to the brackets 32 and 83 by means of a =bolt 53 which extends jointly through said levers and the two flanges 35. By means of this construction the levers are caused to swing in parallel planes and are restrained from lateral movement out of said planes. 'I'he holes in the levers `5| and 52 through which the bolt 63 extends are situated intermediate the ends of the levers in such a manner that the levers are formed with short arms 54 and '55 nearest the work and with longer arms 56 and 51 Voutwardly thereof.

The end of the arm 55 of lever 5| is constructed with an eye 58 in which is received the end link 5'9 of a chain 6|. The corresponding arm 54 of lever 52 is constructed with an open hook 62 over which may be hooked any of the links of the chain 6I. The other end link 63 of the said chain has been shown as hooked over the hook 62, in Fig. 2. The chain 6| serves as a connecting means between the work and the feed device andvwhen wrapped about the Work, as illustrated in Fig. 1, the same provides two runs 64 and 65 which serve as connectors between the work and the feed device. Connected to the two arms 56 and 51 of' the levers 5| and 52 is a tension coil spring 66, the ends of which are hooked in holes |61 in said arms. This spring tends to move the arms together which has the effect of moving the eye 58 and the hook 62 toward the work. This slackens the levers, permitting of wrapping the chain around the work and hooking the closest link on the hook 62. The movement of the levers 5| and 52 by spring 66 is terminated when the arms 54 and 55 strike the corners of the angle members 21 and 28.

The two levers I5| and 52 are swung about the bolt 53 as a pivot by means of an actuator 61. The actuator 61 is in the form of a breastplate and consists of a channel-shaped plate 61 having a web 69 and flanges 16 and 1| projecting outwardly therefrom. The said breastplate is concave as shown, being bent at the middle, as indicated at 12. The fianges 10 and 1| are enlarged at their ends, as designated at 131 and said enlarged portions have slots 14 formed therein. The arms 56 and 51 of the levers 5| have welded to them strips 15 of metal which forms forks 16 at the ends of said levers. Between these forks are disposed rollers 11 which are rotatably mounted on bolts 18 extending through the slots 14 and through the ends of the forks 16. Suitable washers 19 hold the rollers 12 centrally between the flanges 1D and 1|. Other washers 8| on the ends of the bolts 18 serve the same purpose as the heads of the bolts. The rollers 11 are adapted to roll along the inner surface of the web 69 Aof the breastplate 61.

The operation of the invention is as follows: 'I'he support 26 is first applied to the breastplate |9 of the drill by loosening the nuts 38 of studs 31 and sliding the angle member 21 toward the angle member 28 until the flanges l3| of said angle members engage the sides of the breastplate I9. The nuts 38 are then tightened down. The thumb nuts 48 are next loosened and the clips 42 and 43 moved to the ends of the support 26. The breastplate is then properly positioned and the clips moved toward the extensions 2| until the same engage the extensions, as shown in Fig. 1. Upon tightening the nuts 48 the support 26 becomes properly applied to the drill. 'I'he chain 6|' is next wrapped about the work and the nearest link to the hook 62 is hooked over the same. The operator then grasps the handles l5 and |1 and exerts pressure on the breastplate 61. This may be accomplished by pushing toward the work or by pulling the handles |5 and |1 toward the operator or Iby a combination of both. As the drill operates the pressure so exerted swings the two levers 5| and 52, moving the breastplate E1 toward the work and drawing the eye 58 and hook 62 in the opposite direction. 'I'his procures relative movement of the work and the tool toward each other. It will readily be comprehended that,

if the linl: of the chain should engage a VVcorner `of the ywork sothat it would be impossible to center the chain on the work, one orconnector` would be longer than the other. Due to the Iact that both levers-are pivoted on thesame pivot 53 and operate independently of the support, the support and drill would remain in proper .position and the tensioning mechanism consisting of the levers and breastplate would adjust itself so that equal. tension would be had upon both connectors. 'Ihus the operation of the drill would not'be ail'ected and the drill could be made ybreastplate extending across the other ends of the levers, said breastplate upon movement in a direction toward the work swinging the levers in a direction to procure relative movement of the work and the tool toward each other.

4. A feed device for portable tools comprising a support carried by the tool, a pair of crossed levers pivoted intermediate their ends to the supto drill properly into-the work .and along thel l vline desired. 'I'his construction functions as an equalizing device on the two connectors.

The advantages of my inventionare manifest. The device is extremelysimple and practicalin construction. Whenv the tensioning device is applied to a drill the same does not project 'rearwardly of the drill to such an extent -that'the operator is inconvenienced in using the drill.

port, connectors connected to the ends of said levers nearest the. work and to the work, and a 'breast-plate extending acrossthe other ends of the levers, means for slidably connecting one end of said breastplate' to the vother end of one of said levers, means for movably connectingthe other end of the breastplate tothe other end of the other lever, said breastplate upon movement toward the work swinging the levers in a direction to procure relative movement of the work and the tool toward each other.

with my invention the drill can be advanced by pressure through the breastplate and also by pulling on the handles. This permits the operator to drill in localities where it would be impossible to secure suillcient pressure throughthe footing hadby the operator. 'I'he device is readily adjustable to ilta large number of diilferent types and sizes of drills. The device being operated through pressure on the breastplate leaves the operator with both hands free to hold and 5. A feeddevicefor portable tools comprising a `support carried by the tool, a pair of levers pivotedto-the support, connectors betweenthe levers and the work, resilient means acting betweenboth of the levers and free of the support to swing the levers in a direction to loosen the connection between the work and the tool, and an actuator connected to the levers for `swinging the same in the opposite direction and in opposi- V tion to the resilient means to' procure relative guide the drill. With my invention the movel ments are similar tothose required when operating the drill in the customarymanner so that the operator can operate the drill without diiilculty. By means o! the levers pivoted as ar-l ranged, the tension on the two connectors is equalized whereby the chain' does not have to be centered with respect to the work.

Changes inthe specilcv form of my invention,

as herein disclosed, may be made within the scope of what is claimed without departing spirit of my invention.

Having. described my invention, what I claim as new and desire to protect by Letters Patent is:

1. A feed'device for portable rotary tools comfrom the movement of the work and the tool toward each other.

6. A feed device for portable tools comprising a support carried by the tool, a pair of crossed levers pivoted intermediate the ends thereof to the support and nearer one end of each lever than the other to form in each lever a short arm and .a

long arm, a connector between .each of the short arms and the work, resilient means acting between the long arms oi the levers for causing the levers toswing in a direction to loosen the connection between the work and the tool, and an actuator connected to the long arms of the lever for simultaneously swinging the lever in `a direcprising a support carried by the tool, a pair ot crossed levers pivoted intermediate their ends* to said support, substantially in alignment with the axis of the tool, a connector between two 'of the corresponding ends of the levers and the work, a single actuator connected to the Vother ends of both of the levers Vto procure simultaneous movement Ithereof. vfsaid actuator' being adapted upon movement toward the work to swing the levers in a direction to procure lrelaconnected thereto,said breastplate upon movement toward the work swingingthe levers `in a direction to procure relative movement of the work andthe tool toward each other. l

3. A feed device for portable tools comprising` a support carried by the tool, a pair of crossed levers pivoted intermediate their ends to the support, connectors connected to the ends oisaid tion to procure relative movement of the work and the tool toward each other.

-' '1. In combination with an electric drill having abreastplate formed withy free ends, a support comprising two -angle members, means for guiding said angle members for transverse movement relative to onel another to cause the same to engage the sides of the breastplate of the drill,

vclips adjustably movable along said angle members for engaging the free ends of the breastplate of the drill, a tensioning device carried by said support, aconnector for connecting the work and said tensioning device, and an actuator for operating said tensioning device.

8. In combination with an electric drill having 'a breastplate formed with free ends, a support channel-shaped in cross section and receiving the breastplate of the drill therebetween, clips carried by said support and engaging the ends of the breastplate, atensioning device carried by said support, a connector connected to the work and extending across the ends of'the long arms and to said tensioning device, and an actuator for operating said tensioning device.

9. A feed device for portable tools comprising a support carried by the tool, 'a pair of fcrossed levers pivoted intermediate their ends to said support, connecting means between two of the corresponding ends of the levers and the work, a breastplate extending across the other ends oi' the levers, said breastplate and onel of said levers having juxtaposed parts, a slot formed in oneof levers-nearest the work and tothe work, and a 7'5V said juxtaposedv parts, a member'carried by the other part and slidable in said slot, and means for connecting the other end of the breastplate to the other end of the other lever.

10. A feed device for portable tools comprising a, support carried by the tool, a pair of crossed leverspivoted intermediate their ends to said support, connecting means between two of the corresponding ends of the levers and the work, a breastplate extending across the other ends of the levers, said breastplate having a slot at one end thereof, a member carried by the lever associated withsaidendoftbebreastplateandslidablc along said slot, and means for movably connecting the other end of said breastplate to the other end of the other lever.

l1. A' feed device for portable tools comprising a. support carried by the tools, a. pair of levers pivoted to the support. a. connector between one end of each of the levers and the work, and means for simultaneously moving both levers to cause l0 simultaneous tension on the connectors.

HERMAN IULBERG. 

